Aw, fantastic to have a living great-grandmother. I love
George, it's such a friendly name.
All the names you've chosen are nice - it's very hard to choose a sibset, but maybe
George,
William and
Matilda, or
George,
Rupert and
Jemima.
George goes nicely with all of your names as a combo, but
George Charles,
George Henry and
George Lawrence would be my top choices.
Other combos:
George ArthurGeorge AlbertGeorge FrederickGeorge MilesGeorge PhilipGeorge OswaldGeorge VictorGeorge DuncanGeorge Wystan